Unit carry device for accumulators



April 4,1950 E. J. :SOCHACZEWSKI 2,503,004

UNIT CARRY DEVICE FOR ACCUMULATORS 7 Filed July 14, 1948 I 4 Sheets-Sheet l April 4, 1950 E. J. SOCHACZEWSKI 2,503,004

UNIT CARRY DEVICE FOR ACCUMULATORS BYw f a ATTORN Patented Apr. 4, 1950 UNIT CARRY DEVICE FOR ACCUMULATORS Edward J. Sochaczewski, Endicott, N. Y., assignor to International Business Machines Corporation, York New York, N. Y., a corporation of New Application July 14, 1948, Serial No. 38,671

4 Claims.

This invention relates to accounting machines of the type in which successive entries are made in an accumulator to be accumulated to represent a total.

The invention pertains particularly to improvements in the entry arrangements for the accumulator and especially to improvements in the units carry devices therefor.

As explanatory of the present invention in ac counting machines which are controlled by perforated records for carrying out statistical work, the entries are made rapidly in succession, the period of time that each entry takes constituting a cycle. Obviously, thousands and thousands of entries consume an appreciable amount of time and therefore for rapid statistical Work it is highly desirable that the period of time for each cycle be shortened to the minimum.

It is, therefore, the principal object of the present invention to devise an entry arrangement wherein entries and units carries, when required, are effected in a much shorter entry cycle than heretofore.

The present invention resides particularly in shortening the time required to effect units carry for the accumulators and provides an arrangement for efiecting a unit carry in a normal manner but continues the advance of rotation of the accumulator wheel to efiect the next entry without declutching the accumulator wheel after the units carry.

The present invention may, in its broadest aspects, find embodiment in units carry devices of either the mechanical or electrical type. In machines of either type it is usually the practice to clutch the accumulator wheel to the main drive for a period necessary to rotate or advance the wheel a single step and then upon the termination of this step of operation declutch the wheel from the main drive.

When a subsequent entry is to be efiected the accumulator wheel is again clutched to the main drive for a variable period of time necessary to effect the digit entry. Obviously, the declutching of the accumulator wheel and the subsequent clutching to the drive after a units carry has been effected takes an appreciable amount of time.

It is by the possibility of eliminating this declutching operation that the period of the cycle is appreciably shortened.

In the present arrangement and in one embodiment of the invention the accumulator wheel is retained in engagement with the main drive whenever a digit entry follows a prior units carry operation in the same denominational order.

Therefore, not only is an appreciable amount of time saved but there is also the elimination of operation of the declutching mechanism for this accumulator order.

The present invention finds particular use in units carry devices of the electrical type wherein an impulse to one magnet initiates the units advance of the accumulator wheel and a later impulse to another magnet terminates the advance by effecting a declutching operation.

It is, therefore, an object of the present invention to provide an electrical circuit which is under control of the entry control means so that an impulse which initiates the entry will block the impulse which would normally be directed to the magnet which would terminate the units carry. This method of blocking renders ineffective the normal stop impulse to declutch the wheel and therefore the wheel remains clutched to continue on with the digit entry operation.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

Fig. 1 is a view in side elevation of the units receiving mechanism of an accumulator order in which the units digits 0, 1, 2, 3 or 4 are entered and represented.

Fig. 2 is a detail view showing the driving clutch mechanism therefor.

Fig. 3 is a detail view of the 0 or 5 multiple digit representing wheel in which the 5 component is entered and represented.

Fig. 4 is a timing diagram.

Figs. 5a, b, c, when assembled in this order 5a, 5b, 5c constitute a wiring diagram of the circuits for controlling, according to the present invention, entries and units carry operations of the accumulating mechanism.

The card In Fig. 5a is shown a portion of a record card l0 provided with vertical columns in which the digits 1 to 9 and 0 may be designated by perforations made in four horizontal rows of like index point positions having the assigned values 3, 5, 1, 0. These values are entered singly, or in combination, with carries initiated by a preceding entry cycle and all completed in a relatively short, or 6-point accumulatinng cycle (see Fig. 4).

It is diagrammatically indicated that the card In is fed by sets of feed rollers H downwardly past a row of sensing brushes i2 and, after the perforations in the lower field or deck A of card If) have passed the brushes i2 the sensing of the perforations in the middle field, or deck 13 of the card, immediately follows without loss of time. Then the perforations in the upper deck C of the card are sensed. The period of operation between the corresponding horizontal rows of index points of two successive fields is termed an entry cycle of the machine, and each entry cycle is subdivided into six so-called cycle points. In Fig. 4 the period in a cycle during which brushes l2 sense the 3, 5, l, value positions and Z position is shown in relation to the timing of closure of a number of cam operated contacts which are driven from a suitable shaft (not shown) and synchronized with the rotation of the card feed rollers to efiect closure or" the electrical contacts at the times indicated.

The accumulator In Fig. 1 drive shaft is is suitably geared to the shaft which drives the card feed rollers, so as to make one-third. revolution for each entry cycle of operation. For each denominational order of the accumulator, shaft l3 has two gears 14 secured thereto which drive two identical clutch mechanisms, one for rotating the 0 or digit receiving and representing wheel (Fig. 3) and one for the (l, 1, 2, 3 or 4 digit receiving and representing wheel (Fig. 1).

This clutch driving mechanism is similar in construction to that shown in Lake et al., Patent No. 2,328,653 and includes a ratchet l5 which rotates freely on stud i6 and is attached to the gear 11 which is driven by gear i l (Fig. 2). Rotatably mounted on stud i5 is a wheel 29 having ten teeth Ella, each adapted to be engaged by a tooth 2la on the long arm of a clutch lever 2| to hold the wheel against rotation in a counterclockwise direction. At the side of wheel 20 is a units receiving wheel Z lrotatable on stud it and provided with ten peripheral notches 26a. Wheel 24 may, in one entry cycle, take any of the five digit representing positions 0, 1, 2, 3 and 4. A spring pressed lever it engages with each notch 24a of wheel 24 to hold the wheel impositively and to align it at the digit position to which it has been rotated. A carry control cam 25 is fixed to the side of wheel 2% and a stud 21 in wheel 24 extends through an opening in wheel 2B to pivotally carry a clutch dog 38. A spring 3! urges the tooth of dog 39 to engage ratchet l5. In the position shown in Fig. 1, the clutch lever 2| is in declutching position; its tooth 2la is restraining rotation of wheel 26 counterclockwise and dog 3% is clear of ratchet 5. The dog is being held clear of the ratchet it by coaction of a pin 3% on the dog with a cam edge 2% of wheel 20.

When the free end of clutch lever 2! is lowered to disengage its tooth 2 la from tooth 28a to release the wheel 20 for counterclockwise movement, the spring 3! is effective to rock the clutch dog 30 into engagement with ratchet l5. During this movement of the clutch dog 39, its pin 30?) rides down the cam edge 2% and earns the wheel 20 counterclockwise until its tooth Elia, previously engaged by tooth 2 la, is to the right of the latter tooth. The parts are then in the clutching position shown in Fig. 2 and the accumulator wheel 24 is coupled to the drive gears 15, l! for rotation. Through engagement of the pin Bill) of the clutch dog 36 with cam edge 2%, the wheel 20 4 is forced to rotate counterclockwise together with the 0-4 entry receiving wheel 24.

When the clutch lever 2! is raised to upper declutching position, its tooth Zia intercepts a tooth Ella of wheel 20 and stops the wheel. The accumulator wheel 2 and clutch dog 36 continue rotating while cam edge 2% of wheel 25 cams the pin 3% upwardly until it is again in its outer position. As the pin Bill) is cammed outwardly clutch dog 36 moves clear of ratchet l5 and declutches the accumulator wheel 26 from the driving means. The accumulator wheel is then held and aligned in its new digit representing position by lever 25. A spring-urged impositive latch 35 serves to hold lever 2% in either clutching or declutching position.

The clutch lever El has a short arm swiveled to the lower end of an armature 3'6 which is disposed between an advance magnet AM and a stop magnet SM. Energization of magnet AM rocks armature 36 clockwise to lower lever 2| and energization of magnet SM rocks armature 36 counterclockwise to raise the lever 2 5.

When accumulator wheel 24 is at its 0, 1, 2 or 3 digit representing positions the carry control cam 26 holds a carry lever 3i pivoted at 38 in the position shown in Fig. 1, where a contact blade 39 (insulated from lever 31) takes a mid-position between contact elements it and ll. When the wheel is in its 4 position a tooth on lever 3? is dropped into a cut 26a of cam 25 and blade 39 contacts element ii. When the wheel 25 moves from the 4 to (2 digit representing position, which means an entry of 5, a rise 26b rocks lever 37 to cause blade 39 to engage contact element it. When the lever N is so rocked, an arm 42 integral therewith is engaged and held by a springurged impositive latch d3, which maintains the contact engagement between 39 and id until a mechanical knockoff pin it secured to gear it rocks latch 63 to unlatch contacts 3?], it. Pin l0 also raises the lever 21 to stop rotation of accumulator wheel 2 after a unit carry. The point in the cycle at which such contact unlatching occurs and clutch disengagement is indicated in the time chart of Fig. 4 for pin 70.

Through the mechanism just described the units 1 to 4 are entered in the digit representing wheel 24. Through an exactly similar mechanism the 0 or 5 multiple digit representing wheel 45 (Fig. 3) is also driven with the difference that if it is advanced it moves only one step in each entry cycle to go from G-5 or from 5-0. Accordingly, the wheel d5 has a carry cam 41 provided with five cuts did, and also five rises l'lb coacting with a carry lever 48 which maintain blade 49 in a central position when the wheel is in its 0 digit representing position, to permit it to contact element 58 when it is in its 5 digit representing position and to cause it to contact theelement 5i when it passes from a 5 to a 0 digit representing position. On this last movement, the blade 39 is latched in the same manner as block 39 but is released by a mechanical knockoff which also terminates the movement of wheel it either from 0-5 or from 5-0.

This mechanical knockoff consists of a series of six pins M carried by the gear M which drives the 0-5 multiple entry wheel 6. The time that the pin Alt effects a mechanical knockofi in each entry cycle when the wheel 66 is moved a step from 0-5 or 5-0 is shown in Fig. 4. It will be seen in Fig. 4 that the mechanical knockoff by pins it occurs at two different times during each cycle for reasons which will be evident later.

Thus, for each denominational Order of the accumulator there is provided a units and a multiple digit representing wheel and related driving mechanisms, generally of like construction. There are also differences in the configurations of their carry cams 26 and 41 and these two accumulating mechanisms might be termed the -5, multiple digit representing the mechanism and the 0, 1, 2, 3, 4 units digit. receiving and representing mechanism.

Circuit diagram The manner in which digital values are additively entered will now be explained in connection with the circuit diagram, which for the reason of simplicity shows the wiring connections for three complete orders of an accumulator constructed according to the present invention. In practice more denominational orders are provided, these being merely duplicates of the three orders shown herein.

For eifecting entries, suitable plug connections 55 are made between the brushes l2 and plug sockets 56 of the three accumulator orders: U- units, T-tens and H-hundreds, reading from right to left in Figs. b and 50. Current is provided by the lines 58 and 59.

There will now be explained the manner of effecting the entry of the digit 3 in the units wheel 24 when such digit is to be entered singly as for the entry of the digit 3, or as a component for the entry of digits, such as 4, 8 and 9. This will be better understood by the following Table 1 which illustrates the code.

When a 3 perforation in the units column is sensed a circuit is completed from line 58,

through cam contacts C02 which close at point 1 of the cycle as shown in Fig. 4 at the time the 3 hole is sensed, wire 51, card lever contacts 65 which are now closed, contact roller 6|, the 3 hole in the card, brush l2, plug connection 55, units order plug socket 56, thence through subtraction control SCUI transfer contacts now in normal position, WFIU transfer contacts now in normal position, WCZU contacts now in normal position, wire 62, the AMU advance magnet of the 1-4 units accumulator wheel, and wire 63 to the other line side 59. This will start the wheel 24 turning and it will turn three steps, the entry being then terminated by an impulse to the SMU or stop magnet of the units order associated with the units wheel 24. This energizing circuit, which will now be described, is effective when the single digit 3 is entered alone or as a component, as in each digit entry 4, 8 and 9 in the above table.

The impulse to the stop magnet SM is transmitted by the CZ cam contacts at point 4 in the entry cycle. The circuit extends from line side 58, through cam contacts 0C2 which also close at point 4concurrent with the closure of the CZ cam contacts as shown in Fig. 4, through the CZ cam contacts, relay contacts S04 now closed, RD2 transfer relay contacts now in normal position, thence through the SCU2 transfer contacts now in normal position, wire 64, the SMU stop magnet, wire 63 to the line side 59. The wheel 24 will now be declutched from its drive after it has been rotated three steps to enter this digit.

However, for the entry of the digit 3 when entering the digit 4 and 9 wherein the digit 3 is a component digit as in the above table, an impulse will be transmitted to the SMU stop magnet but it will be ineffective to declutch the accumulator wheel because of the simultaneous receipt of an impulse derived from the 0 hole in the card. In this code for 4 and 9 0 represents a "1 digit entry. When the 0 hole is sensed at the 4 point in the cycle a circuit is completed to the AMU magnet as before but concurrently at the 4 point in the cycle by the circuit just described cam contacts CCZ and CZ also transmit an impulse to the SMU stop magnet. However, since the wheel is now turning, the armature 36 is directly against the AMU magnet so that the impulse transmitted to the SMU stop magnet will be ineffective to attract it because the AMU advance magnet will overcome the eifect of the energization of the SMU stop magnet. Therefore, the wheel will continue to rotate and thus rotate an additional step at which time an impulse is directed by cam contacts CCZ and CZ at point 5 in the cycle to terminate this additional unit entry. Thus, in the case of the entry of the digits 4 and 9 the wheel will move four steps instead of three steps caused by the sensing of the 0 hole which has the meaning of the digit 1 in the above code.

The manner of effecting the entry of the digit 1 alone as in the entry of the digits 1, and 6 or as a component in the entries of the digits 2 and 7 will now be described: The circuits are precisely as has been described except that the sensing of the 1 hole occurs in the 3 point of the cycle and the wheel will turn one step until an impulse transmitted by the C02 and CZ cam contacts at point 4 in the cycle will terminate the entry for the digits 1 and 6. However, in the case of the digits 2 and 7 the impulse transmitted by the CO2 and CZ cam contacts at point 4 in the cycle will have no effect because of the simultaneous receipt of an impulse from the 0 card hole in the entry of the digits 2 and 7. Therefore, the wheel 24 will continue to rotate an additional step for the reason as has just been described in the entry of the digits 4 and 9 until cam contacts 002 and CZ transmit an impulse at the 5 point in the cycle to the SMU stop magnet associated with wheel 24.

The above is a description of the manner of entering the desired digits 1, 2, 3 and 4 in the units wheel 24. It should be noted that upon sensing the 0 hole alone when it represents the digit 0, there will be concurrent impulses transmitted to the AM and the SM stop magnet at point 4 in the entry cycle. Therefore, the armature 36 will remain in the position shown in Fig. 1 and no entry will be effected upon sensing the 0 hole.

Multiple units entry of 5 A step of operation of wheel 46 to enter the multiple units 5 and thus turn the wheel from .0 5 or from 5-0 is caused when the 5 hole is sensed. Preceding the sensing of the 5 hole cam contacts CCB close so as to energize the WP relay by an obvious circuit so that at thetime the 5 hole is sensed contacts WFl and WF2, U, T and. H are already transferred.

Upon sensing the 5 hole a circuit is completed from the line side 58 through cam contacts C02 which are closed at the time the 5 hole is sensed,

wire 51, card lever contacts 60, contact roll 6|, brush l2, the 5 hole in the denominational order it is sensed, plug connection 55, plug socket 56 and assuming the digit entries are to be effected in the units order then through SCU! contacts now normal, WFIU contacts now transferred, wire 65, WCIU contacts now in normal position, to the AMFU magnet of the units order, wire 66, thence to line 59. The wheel 46 is now clutched to the driving mechanism and it will begin to turn one step of a point later as indicated in Fig. 4 for the timing of the wheel 46. After one step of rotation one of the knockout pins 44 will at point 3 in the cycle rock the lever 2! associated with the multiple 5 entry clutch mechanism clockwise, thereby declutching wheel 46 from the driving mechanism. Accordingly, if the wheel 46 originally represented it will be turned to the digit representing position and if it was originally at the 5 digit representing position it would I be turned one step to represent 0, and after such rotation a units carry operation to the next order will be effected as will be described.

Units carry to 5 entry multiple wheel 46 of same order when 0-4 entry wheel moves from 4-0 As the several wheels advance they coact with their related carry contacts which will prepare transfer circuit connections as will now be explained.

Assume that in the units order the 0-4 wheel 24 passes from 4 to 0, closing and latching contacts 39, 40 which will be closed at point 6 in the cycle. The contacts 39', 40 may also latch closed at any point 2, 3, 4 and 5 during the entry cycle because of summation of the original digit and the new digit entered in wheel 24..

Just prior to point 6 of the cycle cam contacts CC! close to energize the WC relay. WC relay transfers the WCIU, T and H contacts to prepare units carry circuit for the 5 multiple wheel 46. At point 6 of the cycle 2, units carry circuit is completed from line 53, cam contacts CCl, wire 61, contact point 40 of the units order, related contact blade 39, wire 68, contacts WC'IU now transferred, to the AlVlFU advance magnet associated with the units order 0-5 multiple digit wheel 46, wire 66, to line 59. The wheel is now clutched for a units operation beginning at the last point in the cycle, as shown for the Carry timing for wheel 45. This carry extends into point 1 of the next cycle at which time a, mechanical knockofi pin 10 unlatches contacts 39, 40 as has been described. One of the mechanical knockoff pins 44 for wheel 46 also rocks clutch lever 21 to disengage the clutch of wheel 46 so that wheel 46 will receive a units rotation. Wheel 46 moves from 0-5, or from 5-0, depending upon its original digit standing.

Units carry to next higher order wheel 24 when lower order wheel 46 has moved from 5-0 and wheel 24 represents 1-4 by cam contacts CCi extends through contact element 5|, contact blade 49', wire. ll, WCZT contacts now transferred, to the. AMT advance magnet of the wheel 24 of the tens ordeigwire 63, line 8 side 59. At the beginning of the next cycle a stop impulse is transmitted to SMT stop magnet of the tens order by the following circuit.

From wire H there is a branch wire 12 to the pickup coil P of a delay relay EDT. The branch circuit extends from wire 12, P relay coil, wire 13, wire 66, to line side 59. A hold circuit for the hold coil H of the RDT relay extends from wire 13, RDTH relay coil, RDI relay contacts, wire 14, cam contacts CDI-I to line 58. The RD relay transfers its contacts RDZ. At point 1 of the cycle, an impulse circuit extends from line 58, CCZ cam contacts, CT cam contacts, S05 contacts now closed, wire 15,-wire 16, RD2 relay contacts of the tens order, wire Tl, SCT2 relay contacts now in normal position, wire 18, SMT stop magnet of the 0-4 wheel 24 of the tens order, wire 63, to line 59..

Contacts 49, 5| are unlatched in the manner previously explained by the mechanical knockoff pin T0. The carry time for wheel 24 is also shown in Fig. 4, it being noted that it terminates at the beginning of the next cycle during the time that a 3-digit entry may be initiated by an impulse from the 3 hole in the record. In this case, as will be clearer later on, the impulse to the stop magnet SMT is ineffective to declutch accumulator wheel 24.

Units carry to next higher order wheel 24 when lower order wheel 46 is at 5, and lower order wheel 24 goes from 4-0 In this instance contacts 39-40 of the units (or any lower order) are closed as well as contacts 49, 50 of the same order. The carry initiating impulse is from line side 58, CC! cam con tacts, wire 61, contacts 40, 39, wire 68, contacts 50, 49, wire ll, WCZT relay contacts now transferred AMT start magnet, wire 63, to line side 59. The RDT relay is picked up, as before, and its contacts RDZ are transferred to cause the stop impulse from CCZ and CT cam contacts to be transmitted to SMT stop magnet. However, if an impulse is concurrently received by AMT start magnet, the impulse to SMT stop magnet will be ineffective to declutch wheel 24, as will be more evident later on.

Carry'by carry operations It a carry is efiected from alower to higher order units wheel 24 and the 0-4 units wheel 24 of such higher order already stands at 4', a carry should be efiected to the 0-5 wheel of the same higher order. In this case contacts 39-4l of the tens order (for example) are closed and a branch circuit extends from wire H, then through contact element 4| and contact blade 39' of the tens order, relay contacts WCIT of the tens order, now transferred, thence to the AMFT magnet of the 0-5 multiple wheel, and thereby a step of rotation' of the 0-5 multiple wheel will be performed. That is, if the tens order wheel 24, for example, has a- 4 standing thereon the" multiple 0-5 wheel 46 advances to 5 or 0 and the 1-4 units wheel advances to 0.

Continuation of digit entry of 3 after units carry without declutching From Fig. 4 it is evidentthat the carry timing for wheel 24 shows that a carry operation starts at the last part of a cycle and extends through a greater part of point 1 of the next cycle. At this point 1 in. the cycle cam' contacts C02 and CT transmit through RDZ transferred contacts an impulse to the stop magnet SM of the order: in

which a carry has been performed to terminate the unit carry in the wheel 24. At this point 1 in the cycle an impulse as has been described may be received from the card to start a 3 entry in wheel 24 and if a 3 entry should be initiated then there will be a simultaneous transmission of an impulse to the AM magnet with the impulse to the SM magnet. The impulse to SM magnet will be ineffective to declutch the accumulator wheel 24, since the armature 36 is directly against AM magnet. Thus, without declutching, the 3 entry is initiated. In the present machine, it is shown by way of example, how a loss of time can be avoided by continuing with one of a series of digit entries, 3 herein, to extend the I carry entry to 4, without declutching. Of course, this same principle of operation can be utilized where .each digit entry 1-9 is a continuous one, rather than successive, as herein.

Subtraction Provision is made for entering amounts subtractively by the method of adding tens complements.

, The subtraction control which conditions the digit entering arrangement to effect subtraction by the complemental process is under control of the perforation placed at the Z index point position which is punched in any column set aside for such control and preferably in the middle deck B of the same card. This column is sensed by means of one of the sensing brushes at the deckB reading station. At the time that the Z hole is sensed cam contacts CCZ close as shown in Fig. 4 so as to complete a circuit from the line 58, through CCZ cam contacts, wire 51, card lever contacts 99, wire 80, contact roll GIU of the upper or control reading station, through the Z hole, brush 8|, plug connection 82, plug socket 83, thence through the RS relay to line side 59. The latter closes the RS2 and the RSI contacts so that a hold circuit extends through relay contacts RSI, wire 84, and cam contacts CC5 to line side 58. The latter contacts close at the time the Z hole is sensed to extend the time of energization of the RS relay over to the next cycle at which time the card is sensed at the lower or entry control station. One point in the cycle after CO5 cam contacts close CC4 cam contacts close so as to complete a circuit from the line 58, cam contacts 004, through RS2 relay contacts, the SC or subtraction control relay, wire 86, wire 56, to line 59-. Cam contacts C4 also extend the energization of SC relay over to the first part of the next cycle. Before CC4 contacts open CO3 cam contacts close so that the SC relay is held energized as long as cam contacts CC3 are closed by a circuit from line 58, cam contacts CO3, SC6 hold contacts now closed, SC relay coil, wire 86, wire 66 to line side 59. CC3 cam contacts are closed during the time that the 3, 5, 1 and 0 holes are sensed in succession and also during the time that the cam contacts CCZ normally attempt to enter the digits 3, 5, 1 in succession to normally attempt to enter 9 in each denominational order. The energization of the SC or subtraction control relay transfers its 1 and 2 contacts and closes its 3 contacts in each denominational order.

The digit 9 is entered in each denominational order when a 0 is represented in such order, by entering the digit 3 and 1 in the units accumulator wheel 24 and the digit in the multiple wheel 49.

. .When the machine is conditioned for subtrac- .tiongoper ations at point]. in the cycle a circuit 10 will be completed to enter the digit 3 in wheel 24 of each order by the following circuit for the units order. From line 58, through CC2 cam contacts, cam contacts CTZ also closed at point 1 in the cycle, wire 81, SC4 contacts now transferred, wire 88, wire 89, RD2 contacts now in normal position, the SCUZ relay contacts now transferred, WCZU contacts now in normal position, wire 62, to the advance magnet AMU of the units wheel 24, wire 63, to line 59, thereby initiating the entry of the 3 digit. However, at the 4 point in the cycle a supplementary impulse is given to the AMU advance magnet after the 3 entry has been made. Such circuit extends from line 58 through the C02 cam contacts, CTZ cam contacts which close at point 4 in the cycle, wire 81, SC4 relay contacts now transferred since the SC relay is still energized because CC3 cam contacts are closed, wire 88, wire 89, the RD2 relay contacts, SCU2 relay contacts now transferred, WQZU contacts now in the normal position, wire 62, to the advance magnet AMU of the units wheel 24, wire 63, to line 59. Thus, the 3 entry is extended so as to add an additional unit. The termination of the 4 entry made in this manner is efiected by transmitting an impulse to the SM magnet associated with wheel 24 by the following circuit: Line side 58, cam contacts CC2, which also close at point 5, cam contacts CZ, relay contacts SC4 which are now normal because CO3 cam contacts have opened to drop SC relay, wire 88, wire 89, RD2 relay contacts now in normal position, the SCU2 contacts now in normal position, wire 64, to the SMU magnet wire 63, to line 59, thus terminating the 1 digit entry. At point 2 in the cycle an impulse is transmitted to the AM magnet of the multiple digit wheel 46 to turn it one sep to represent an entry of the multiple digit 5 by the following circuit: Line 58 cam contacts CC2, CF cam contacts which close at point 2 in the cycle, wire 89, SCU3 relay contacts now closed, WCIU relay contacts now in normal position to AMFU magnet associated with wheel 46, wire 86, to line 59. This will effect a multiple digit 5 entry in wheel 46 and the mechanical knockoif terminates this 5 digit entry, as has been explained.

From the above it is evident that there is normally an attempt to enter 9 in each denominational order and for effecting complement entries the presence of a hole in the card will cancel certain of these normal entries, such as 5, 3, and 1 and in other cases the normal 3 entry will be modified to effect only the entry of the digit 2. This will be better understood by reference to Table 2 below:

Table 2 its Holes Modified Cancelled Ultimate g at subtraction Entries Entries Entry 0 5,3,1 9 1.. 1 5,3,1 3 to 2 1 5,2,1=s 2.. 1,0 3,1 3 to 2 5,2=7 3.. 3 5,3,1 3 5,1=5 4.. 3,0 5,3,1 3,1 5=5 5. 5 5,3,1 5 3,1=4 5.- 5,1 5,3,1 3 to 2 5 2,1=3 7. 5,1,0 5,3,1 3 50 2 5,1 2=2 8.. 5,3 5,3,1 5,3 1=1 e 5,3,0 5,3,1 5,3,1 0=0 .sensed since. it appears in.the present code for the representation of the digits 3, 4, 8 and 9 inclusive. Upon sensing of the 3 hole a circuit is completed from the line 58 through cam contacts (302, wire 51, card lever contacts 60, contact roll 6!, brush l2, plug connection 55, and assuming that the units order is involved the circuit continues from the plug socket 56, SCUI contacts now transferred, WFZU contacts now in normal position, wire 64- to the SMU stop magnet, wire 63, to line 59. This impulse is directed to the SMU magnet concurrently with the transmission of the impulse to the AMU magnet and therefore the attempt to enter 3 in the'multiple digit wheel 45 will be nullified.

The manner of cancelling the 5 entry in the next cycle point 2 is effected by a similar circuit which is the same up to the plug socket 56, the circuit then extending from such plug socket 56, through SCUl contacts now transferred, WFZU relay contacts now transferred, to the SMFU stop magnet associated with wheel 46, wire 66, to line side 59. From Table 2 it is evident that the nullification of this entry is effected in entering the complement of the digits 5, 6, 7, 8, and 9 since, for the present code for the representation of the digits .5, 6, 7, S, and 9, the 5 hole appears.

The sensing of the hole which appears in the representation of the digits 2, 4, 7, and 9 causes the nullification of the 1 digit entry which would ordinarily follow the entry of the digit 3. Upon sensing of the 0 hole in point 4 of the cycle a circuit is completed similar to that described for the 3 hole to the SMU magnet concurrently with the transmission of the impulse to the AMU magnet. Thus this 1 entry is nullified entering the complement of the digits 2, 4, '7

and 9.

In entering the complement of the digits 1, 2, 6 and 7 the normal 3 entry is modified to effect an entry of 2 which is effected upon sensing of the 1 hole which appears in the combination of holes for representing the digits 1, 2, 6, and '7. Upon sensing the 1 hole an impulse is transmitted to the SMU magnet associated with wheel 24 so that the normal 3 entry is shortened to effect the entry of the digit 2.

Unit carry operations are effected, of course, in the same manner as has been previously described because the entering of the nines complement requires units carries in the same way as if the entries were additively entered. For this reason it is unnecessary to explain the unit carry operations for subtrac ion, it being noted only that when a units carry is effected, if there is a normal 3 entry in subtracting by the complemental process, the wheel 24 remains clutched so that the 3 digit entry is a continuation or uninterrupted extension Of a units carry.

It is, of course, necessary to enter the fugitive unit to convert a nines complement to a tens, complement but the arrangement is not described herein since it is well known. The fugitive unit is carried out in the normal manner, that is, the carry mechanism for the units order operates whenever in subtraction the highest denominational order passes from 9 to 0. In Fig. c the plug socket 9| for fugitive entries is shown which would pick up the RDU relay to effect units carries in the units order in the same manner as has been described.

While there have been shown and described and pointed out the foundamental novel features of the invention, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in 12 its operation may be made by those skilled in the art without departing from the spirit of the invention. It is the intention, therefore; to be limited only as indicated by the scope of the following claims.

What is claimed is:

'1. In a cyclically operable accumulating mechanism of the type wherein a digit entry or unit carry in digit receiving means of each order is initiated by an impulse transmitted to a start magnet and a unit carry is terminated by an impulse transmitted to a stop magnet, and wherein concurrent impulses to both start and stop magnets cause the start magnet to render the stop magnet ineffective to terminate the unit carry to thus merge the unit carry with the digit entry, the combination of entry controlling means for selectively transmitting an impulse to the start magnet at a plurality of predetermined points in the cycle of entry operations, means under control of the digit receiving means of lower order when a certain digit position is represented to transmit a carry impulse to the start magnet of next higher order to initiate a unit carry, and cyclically operable means rendered efiective after said impulse is transmitted to the start magnet of next higher order for transmitting an impulse to the stop magnet of said next higher order to attempt to terminate the unit carry, said impulse being transmitted to the stop magnet at a point coinciding with one of said predetermined points when an impulse is transmitted by said entry controlling means to the start magnet of said next higher order, whereby concurrent impulses to the start and stop magnets of next higher order causes the start magnet to render the stop magnet ineffective to terminate the unit carry and thus merge itwith the digit entry.

2. In a cyclically operable accumulator mechanism of the type wherein a digit entry or unit carry in digit receiving means of each order is initiated by an impulse transmitted to a start magnet, and a unit carry is terminated by an impulse to a stop magnet and concurrent impulses to both start and Stop magnets causes the start magnet to render the stop magnet inefiective to terminate the unit carry to thus merge the unit carry with the digit entry, the combination of entry controlling means to transmit an impulse at a predetermined point in the cycle to a start magnet of an order higher than the units order to initiate a digit entry, means under control of said digit receiving means of next lower order when it represents a certain digit position to transmit an impulse to the start magnet of said higher order to initiate a unit carry in said higher order, normally ineffective means to transmit an impulse at said predetermined point in the cycle to the stop magnet of said higher order, and means under control of said digit receiving means of next lower order when it represents a certain digit position to render said last named impulse means efiective to transmit an impulse to the stop magnet of next higher order at said predetermined point in the cycle whereby concurrent impulses to the start and stop magnets of the next higher order causes the start magnet. to render the stop magnet ineffective to terminate a unit carry and thus merge the unit carr with the digit entry.

3. In a cyclically operable accumulator mechanism of the type wherein a digit entry or unit carry in digit receiving means of each order is initiated by an impulse transmitted to a start magnet, and, a unit carry is terminated by an impulse to a stop magnet and concurrent impulses to both start and stop magnets causes the start magnet to render the stop magnet inefiective to terminate the unit carry to thus merge the unit carry with the digit entry, the combination of entry controlling means to transmit an impulse at a predetermined point in the cycle to a start magnet of an order higher than the units order to initiate a digit entry, unit carry means under control of said digit receiving means of next lower order when it represents a certain digit position to transmit an impulse to the start magnet of said higher order to initiate a, unit carry in said higher order, normally ineffective means to transmit an impulse at said predetermined point in the cycle to the stop magnet of said higher order, a relay, means under control of said digit receiving means of next lower order when it represents a certain digit position to energize said relay, means to retain said relay energized at said predetermined point in the cycle, and means under control of the energized relay to render said last named impulse means effective to transmit an impulse to the stop magnet of next higher order at said predetermined point in the cycle whereby concurrent impulses to the start and stop magnets of the next higher order causes the start magnet to render the stop magnet ineffective to terminate a unit carry and thus merge the unit carry with the digit entry.

4. In a cyclically operable accumulating mechanism of the type wherein the digit receiving means comprises, for each order, a 5-multiple digit receiving element representing 5 or 0 and 8. units digit receiving element representing L4 and (l, and a digit entry or unit carry in the units digit receiving element of each order is 14 initiated by an impulse transmitted to a start magnet and a unit carry is terminated by an impulse transmitted to a stop magnet, and wherein concurrent impulses to both start and stop magnets will cause the start magnet to render the stop magnet ineffective to terminate the unit carry and thus merge the unit carry with the digit entry, the combination of entry controlling means for selectively transmitting an impulse to the start magnet at a predetermined point of the entry cycle, means under control of the two digit receiving elements of lower order when the 5- multiple digit receiving element goes from 5 to 0 and the units digit receiving element represents either 1, 2, 3, or 4, or when the 5-multiple digit receiving element represents 5 and the units digit receiving element goes from 4-0 to transmit a carry impulse to the start magnet of next higher order to initiate a unit carry in the units digit receiving element, and cyclically operable means rendered effective after a carry impulse is transmitted to the start magnet of next higher order for transmitting an impulse to the stop magnet of said next higher order to terminate the unit carry, said impulse being transmitted at a point coinciding with said predetermined point when an impulse is transmitted by said entry controlling means to the start magnet of said next higher order, whereby concurrent impulses to the start and stop magnets of next higher order causes the start magnet to render the stop magnet ineifective to terminate the unit carry and thus merge the unit carry in the units digit receiving element with the digit entry.

EDWARD J. SOCHACZEWSKI.

No references cited. 

